Beginning in Prosser at the intersection of Tenth Street and Grant Avenue; then west to the Yakima River and Prosser Dam; then west across Prosser Dam and the Yakima River to the U.S. Bureau of Reclamation Maintenance Road; then north to Old Inland Empire Highway; then northeasterly on Old Inland Empire Highway to Interstate I-82; then east on the south side of I-82 to the Chandler Canal; then east along the north side of the Chandler Canal to the powerline going across the Yakima River (approximately .4 miles east of Bunn Road); then south along the powerlines and across the Yakima River to Wine Country Road; then west on Wine Country Road to Tenth Street and the point of beginning.